Capstan-screw.



A. 0. BECKER.

OAPSTAN SCREW.

APPLICATION FILED JAN. 9. 1912.

1,024,100. Patented Apr.23, 1912.

UNITED STATES PATENT @FFEQE.

ADOLPI-I C. BECKER, OF OAKVILLE, CONNECTICUT, ASSIGNOR 10 WATERBURY MFG.C0,, OF WATERBURY, CONNECTICUT, A CORPORATION.

CAPSTAN-SCREW.

To all whom it may concern.

Be it known that I, ADoLPH C. BECKER, a citizen of the United States,residing at Oakville, in the county of Litchfield and State ofConnecticut, have invented a new and useful Improvement in Capstan-Screws; and I do hereby declare the following, when taken in connectionwith the accompanying drawings and the characters of reference markedthereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, andrepresent, in

Figure 1 a view in side elevation of a capstan screw constructed inaccordance with my invention. Fig. 2 aview in side elevation of the wireblank from which the screw is swaged. Fig. 3 a corresponding viewshowing the blank after the swaging operation. Fig. 4 a view of the headof the completed screw in transverse section on the line a-Z) of Fig. 1,looking upward. Fig. 5 a corresponding view on the line crl of Fig. 1.

My invention relates to an improvement in that class of screws made foruse in the construction of piano-actions and technically known to thepiano-action trade as capstan screws, the object being to produce at alow cost for manufacture, a capstan screw which shall be at once compactand convenient, and present a neat and workmanlike appearance.

\Vith these ends in view, my invention consists in a capstan screwhaving certain details of construction as will be hereinafter describedand particularly recited in the claim.

My improved capstan screw, as herein shown, consists of a threaded andpointed shank 2 surmounted by an integral tapering head comprising arounded cap or top 3 surmounting four inclined or diverging peripheralarms 4 arranged equidistant from each other and separated at their upperends by four holes 5 the inner ends of which intersect each other at thelongitudinal center of the screw, and the outer ends of which extend tothe outer edges of the said peripheral arms 4 which by the said holesare given a triangular cr0ss-section as shown in Fig.

7 Specification of Letters Patent.

Application filed January 9, 1912.

Patented Apr. 23, 1512. Serial No. 670,281.

4, at points above the bottoms of the holes. The said arms 4 may be saidto unite the edge of the cap 3 to the shank of the screw. The holes 5are provided for receiving the pin by which the screws are turned asrequired in adjusting the action. The lower ends of the arms areinclined with respect to the body 6 of the head, the said bodycorresponding in diameter to the diameter of the blank in its originalform and being therefore smaller than the over-all diameter of thethreaded shank of the screw which is increased in diameter by having thethreads rolled into it as shown in Fig. 1.

In producing my improved capstan screw, 1 first subject a plain wireblank 7, as shown by Fig. 2, to a swaging operation for forming the capor top 3, and the diverging peripheral arms i which are produced withoutreducing the blank in diameter and therefore without weakening it. Theswaged blank is then transversely bored at a right angle to its axis forthe production of the holes 5 and rolled for the production of threadsupon its shank 2. There being little or no displacement of the metal ofthe blank 7 where the peripheral arms i merge into the shank portion ofthe blank, my improved screw is made not only strong and durable, butalso compact.

I claim A capstan screw for use in piano actions, the said screwconsisting of a threaded shank and an integral head, which lattercomprises a cap or top and a plurality of peripherally arranged armsdiverging from the shank and connecting the edge of the said cap withthe said shank, and separated from each other by transversely arrangedholes located directly beneath'the said cap and extending to the outeredges of the said arms and arranged at a right angle to the axis of thescrew.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

ADOLPH C. BECKER.

VVit-nesses FREDERICK G. MASON, J. P. MARSHALL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. i

